Draft inducers for boilers



March 17, 1959 A. A. ARvlNTz ET Al. 2,877,724

DRAFT INDUCERS FOR BOILERS Filed July 7, 1954 QBRQHQM a nRvmTz ROBERT n, QRVINTZ f7 By NATHAN FL QRVINS United States Patent y, z,s77,7z4 DRAFT INDUCERS FoR Bomans Abraham A. Arvintz, Hollis, Robert A. Arvintz, New

York, and Nathan A. Arvins, Brooklyn, N. Y., assignors to Sanicom Company, Inc., Brooklyn, N. Y., acorporation of New York Application July 7, 1954, Serial No. 441,758

3 Claims. (Cl. 110-162) This invention relates to apparatus for use in conjunction with boilers, furnaces and the like to induce circulation of air in providing more efficient boiler operaton. More particularly, the invention deals with an apparatus of the character described, having external bearings for the fan shaft, with means for cooling said bearings.

Still more particularly, the invention deals with an apparatus of the character described, wherein the same is composed of two relatively adjustable casing parts, so as to facilitate wide range use or installation of the apparatus in numerous types of boiler or furnace installations.

The novel features of the invention will be best understood from the following description, when taken together with the accompanying drawing, in which the separate parts are designated by suitable reference characters in each of the views and, in which:

Fig. 1 is a diagrammatic side and sectional view of an apparatus illustrating its arrangement upon a boiler; and

Fig. 2 is an enlarged partial section on the line 2-2 of Fig. 1.

In Fig. l of the drawing, we have indicated a boiler or furnace, in connection with which one of our improved draft inducer apparatus 11 is mounted. The apparatus comprises two casings 12 and 13, the casing 12 having a depending sleeve portion 14 for mounting on the boiler. The sleeve portion 14 forms an inlet for products of combustion coming from the boiler. Adjacent surfaces of the casings 12 and 13 have annular collars or rings 15 and 16, respectively, which lit snugly one upon the other and provide relative adjustment of the casing 13 with respect to the casing 12 in adapting the apparatus to different installations. In this connection, it will be apparent that the sleeve 14 provides different rotatable mountingswith respect to boilers in caring for the installation. The rings 15 and 16 also form a passage communicating with both casings.

The collar or ring 15 has circumferentially spaced set screws 17 to adjustably tix the position of the casings one with respect to the other, these set screws being clearly shown in Fig. 2 of the drawing. The casing 13 also has a projecting annular sleeve portion 18, in conjunction with which a flue pipe 19 is coupled. The sleeve portion 18 forms a large discharge into the iiue pipe 19.

On outer opposed walls of the casings 12 and 13 and in axial alinement are brackets 20, 21 for support of bearings 22, 23 for an enlongated fan shaft 24. This construction keeps the bearings 22 out of the direct ow of heat products of combustion through the casings 12 and 13. This flow is partially controlled by a curved baie wall 25 in the casing 12 and a curvature of the casing wall 13, as indicated at 26. Fixed to the shaft 24 is an impeller or fan 27, which operates in the passage formed by the ring 16, as clearly indicated in Fig. 1 of the drawing, and this fan serves to draw air from the boiler and to discharge the same through the ue 19.

Pivotally supported in one side wall of the casing 12 is a damper 28, also indicated in Fig. 2 of the drawing, the damper operating in the usual manner in control of j 2,877,724 Patented Mar. 17, 1 959 ICC draft through the boiler. Suitably supported on the outer wall of the casing 12 is a motor 29, having a chain or other drive to the shaft 24, in the manner clearly illustrated. Also iixed to the shaft 24, adjacent the ,bearing 22, is a coolant fan 31 to assist in maintaining the bearing 22 in a cool state and the entire structure, namely the bearing 22, motor 29, fan 31 and the drive 30 are contained in an openwork guard 32, which is also secured to the casing 12. A suitable handcrank 33 is provided for manually rotating the motor shaft, as and when desired. Fixed to the shaft 24, outwardly of the bearing 23, is another coolant fan 34 for cooling the bearing 23 and, here again, an openwork guard 35 envelopes the parts, the guard being xed to the casing 13.

A small packing gland or plate 36 is provided on the casing 12 and a similar gland or plate 37 is provided on the casing 13 to seal the shaft 24 where it extends through the casings and to prevent the hot air from directly iiowing out through the casings. One side of the casing 12 is open and this open side is controlled by a covered plate 38. Upon removal of this plate, access is obtained to the boiler opening through the sleeve 14 for any purpose whatever, as well as access being had to the fan 27.

It will be apparent that, with apparatus of the type and kind under consideration dealing with the circulation of heated products of combustion, it is desirable to keep the bearings for the impeller shaft as cool as possible in order that they will give reasonably long service life and maintain the fan or impeller in proper operating condton for along period of time. Thus, by disposing the bearings beyond the limit of the ow of products of combustion through the casings and, further, stimulating circulation of cool air around the bearings by the fans 31 and 34, proper operating conditions of the draft inducer can be maintained for a long period of time. By reason of the relative adjustment of the casings one with respect to the other, it will be apparent that the outlet of the casing 13 can be directed in many dilferent angles, thus providing a wide range of installations, which will render the apparatus adaptable to substantially all uses, regardless of location of a boiler with respect to adjacent boundary walls. From the foregoing, it will be apparent that apparatus of this kind made to special specifications is minimized to a large degree.

Having fully described our invention, what we claim as new and desire to secure by Letters Patent is:

1. A draft inducing apparatus for boilers, comprising a casing adapted to be mounted on and having an inlet communicating with the discharge of products of combustion of a boiler, another casing adapted to be coupled with a flue spaced with respect to said boiler and having a large discharge adapted to communicate withl said ue, means comprising interitting rings projecting from adjacent walls of said casings and slidable and 'r'otatable one with respect to the other for adjustably coupling said casings in controlling position of said discharge of the second casing with respect to the first casing, said rings forming a passage communicating with both casings, each casing having alined bearings disposed outwardly with respect to the chambers of said casings, a shaft arranged axially of said casings and having ends mounted in said bearings, the rings of said casings being in co-axial relationship to said shaft, means, at one end of the shaft, adjacent one of said bearings, for driving said shaft, and an impeller iixed to the shaft, at a position withinthe passage of said rings, for inducing a draft of air from the boiler through said casings and out through said discharge of the second casing.

2. A structure as defined in claim 1, wherein fan blades are mounted on end portions of said shaft adjacent and outwardly of said bearings.

3. A structure 's defined in vclaim 2, wherein each eas 825,828 ing includes a guard of openwork material housing the 2,184,647 bearings and fan blades. 2,617,371

References Cited in the file of this patet 5 UNITED STATES PATENTS 680,309 185,145 Taylor Dec. 5, 1876 239 825,297 Brunck July 10, 1906 535,954

4 Haskins July 1o, 1906 Lane Dec. 26, 1939 Resek Nov. 11, 1952 Tirrell Dec. 1, 1953 FOREIGN PATENTS France Ian. 18, 1930 Great Britain of 1898 Great Britain Apr. 28, 1941 

